SC-1470
Conduction
Lower Sec Science · Secondary 2 · Hard · Conduction
A picnic cooler has a layer of foam between its inner and outer plastic walls. The foam contains many tiny air pockets.
Which statement best explains how the foam layer reduces heat gain from the surroundings?
Which statement best explains how the foam layer reduces heat gain from the surroundings?
- The foam is a good conductor and quickly spreads heat through the walls.
- The trapped air in the foam is a poor conductor and slows conduction of heat.
- The foam increases heat transfer by convection inside the walls.
- The foam reflects all heat radiation back into the cooler.
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